Short-chain basket handle porphyrins: singlet and triplet excited state properties

Reddy, Damodar ; Chandrashekar, T. K. (1993) Short-chain basket handle porphyrins: singlet and triplet excited state properties Chemical Physics Letters, 202 (1-2). pp. 120-126. ISSN 0009-2614

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0009-2614(93)85360-Z

Abstract

The excited state properties of the title compounds and their Zn2+ derivatives, determined by fluorescence and photoexcited tripled ESR methods, are reported. Fluorescence spectral studies indicate that the basket handle porphyrins are less fluorescent than the parent meso-tetraphenyl porphyrin (H2TPP). The combined effects of intersystem crossing and internal conversion account for this difference. Estimated excited state potentials suggest that the cross trans linked isomer (PSI) is a better electron donor in the first singlet excited state. Zero-field splitting parameters D and E of the three isomers evaluated from photoexcited triplet ESR show small but significant differences attributed to distortion of the porphyrin plane caused by introduction of a short bridging group. The electron spin polarization (ESP) pattern remains the same as in H2TPP, indicating the usual spin-orbit coupling mechanism for intersystem crossing.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:85818
Deposited On:06 Mar 2012 07:18
Last Modified:06 Mar 2012 07:18

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